package com.dake.jdk8.npe;

import java.util.Optional;

public class NullPointerException_01 {

    public static void main(String[] args) {

//        testOptional("1");

    }

    public static void testOptional(String id, Optional<String> age) {
        System.out.println("id = " + id + "age = " + age);
    }


}
